TERMINAL APPARATUS, DEVICE FOR DETECTING THE MISMATCHING OF WORK/PROTECTION LINE BRIDGING FUNCTION IN A SYNCHRONOUS COMMUNICATION NETWORK AND THE METHOD

• US 20030012134A1
• Filed: 06/30/1998
• Published: 01/16/2003
• Est. Priority Date: 02/05/1998
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: IKAWA, FUMIHIRO
• Granted Patent: US 6,614,753 B2
• Time in Patent Office: Days
• US Class Current: 370/227
• CPC Class Codes: H04B 10/032 using working and protection systems H04J14/0287 takes precedence
• CPC Class Codes: H04J 2203/006 Fault tolerance and recovery
• CPC Class Codes: H04J 3/14 Monitoring arrangements for SDH/SONET rings H04J3/085

Abstract

An optical receiver unit is connected to each of a work optical line and a protection optical line, and after an optical signal is converted to an electrical signal, only the overhead of the signal is extracted. Furthermore, bytes accommodated in the overhead are demultiplexed. K bytes are transferred to both an APS processing unit and a mismatching judgement unit. The mismatching judging unit judges whether or not a WTR, DNR, RR, etc. are set in the K1 byte received from the opposite station, compares the mode of the opposite station with the mode of its own station, and detects a mismatching between the modes of the opposite and own stations. The result of the detection is transferred to the APS processing unit, and if there is a mismatching, the mismatching is solved.

Claims

1. A terminal station in a synchronous communication network where data are exchanged in units of frames including an overhead for storing a control signal, comprising:

extracting means for extracting from a received overhead information indicating request contents needed to execute a process of automatically bridging a working line and a protection line;

mismatching judging means for judging a mismatching between the work/protection line bridging mode of a terminal station transmitting the information and the work/protection line bridging mode of the own terminal station by judging whether or not the request contents of the information are used in the work/protection line bridging mode of the own station; and

automatic bridging means for matching the work/protection line bridging mode of the terminal station transmitting the information with the work/protection line bridging mode of the own terminal station based on the judgement result of the mismatching judging means.

2. The terminal station in a synchronous communication network according to claim 1, wherein

said synchronous communication network is a SONET or SDH network.

3. The terminal station in a synchronous communication network according to claim 2, wherein

said synchronous communication network employs a 1+1 bridging function.

4. The terminal station in a synchronous communication network according to claim 2, wherein

said information are K bytes in a SONET or SDH network.

5. The terminal station in a synchronous communication network according to claim 4, wherein

said mismatching judging means judges mismatching between revertive/non-revertive modes.

6. The terminal station in a synchronous communication network according to claim 4, wherein

said mismatching judging means judges mismatching between uni-directional/bi-directional modes.

7. The terminal station in a synchronous communication network according to claim 5, wherein

said mismatching judging means judges mismatching by detecting a DNR or a WTR set in said K bytes.

8. The terminal station in a synchronous communication network according to claim 6, wherein

said mismatching judging means judges mismatching by detecting an RR set in said K bytes.

9. An apparatus for detecting mismatching of inter-station operation modes relating to an automatic work/protection line bridging process provided in terminal stations of a SONET or SDH communication network, comprising:

comparing means for judging whether or not a predetermined request relating to the work/protection line bridging is set in K bytes extracted from a signal which is received by the own terminal station; and

mode judging means for comparing the operation mode of a terminal station transmitting the signal which is obtained as the judgement result of the comparing means with the operation mode of the own terminal station, judging whether or not both operation modes are matched and outputting the judgement result.

10. The apparatus for detecting mismatching of inter-station operation modes according to claim 9, wherein

said predetermined request is a DNR or a WTR set in the K bytes.

11. The apparatus for detecting mismatching of inter-station operation modes according to claim 9, wherein

said predetermined request is an RR set in the K bytes.

13. The method for judging operation mode mismatching between terminal stations in a synchronous communication network according to claim 12, wherein

said synchronous communication network is a SONET or SDH network.

14. The method for judging operation mode mismatching between terminal stations in a synchronous communication network according to claim 13, wherein

said synchronous communication network employs a 1+1 bridging function.

15. The method for judging operation mode mismatching between terminal stations in a synchronous communication network according to claim 13, wherein

said information are K bytes in a SONET or SDH network.

16. The method for judging operation mode mismatching between terminal stations in a synchronous communication network according to claim 15, wherein

said step (b) of judging mismatching judges mismatching between revertive/non-revertive modes.

17. The method for judging operation mode mismatching between terminal stations in a synchronous communication network according to claim 15, wherein

said step (b) of judging mismatching judges mismatching between uni-directional/bi-directional modes.

18. The method for judging operation mode mismatching between terminal stations in a synchronous communication network according to claim 16, wherein

said step (b) of judging mismatching judges mismatching by detecting a DNR or a WTR set in said K bytes.

19. The method for judging operation mode mismatching between terminal stations in a synchronous communication network according to claim 17, wherein

said step (b) of judging mismatching judges mismatching by detecting an RR set in said K bytes.

12. A method for judging operation mode mismatching between terminal stations in a synchronous communication network where data are exchanged in units of frames including an overhead for storing a control signal, comprising the steps of:

(a) extracting information indicating request contents needed to execute a process for automatically bridging a work line and a protection line from a received overhead;

(b) judging mismatching between the work/protection line bridging operation mode of a terminal station transmitting the information and the work/protection line bridging operation mode of the own terminal station by judging whether or not the request contents of the information are used in the work/protection line bridging operation mode of the own terminal station; and

(c) matching the work/protection line bridging operation mode of the terminal station transmitting the information with the work/protection line bridging operation mode of the own terminal station based on the judgement result of step (b).

20. A method for detecting mismatching of inter-station operation modes relating to an automatic work/protection line bridging process provided in terminal stations of a SONET or SDH communication network, comprising the steps of:

(a) judging whether or not a predetermined request relating to a work/protection line bridging process is set in K bytes extracted from a signal which is received by the own terminal station; and

(b) comparing the operation mode of a terminal station transmitting the signal which is obtained from the judgement result of the step (a) with the operation mode of the own terminal station, judging whether or not both operation modes are matched and outputting the judgement result.

21. The method for detecting mismatching of inter-station operation modes according to claim 20, wherein

when said predetermined request is a DNR, it is judged that the operation mode of a terminal station transmitting said signal is in a non-revertive mode, and

when said predetermined request is a WTR, it is judged that the operation mode of the terminal station transmitting said signal is in a revertive mode.

22. The method for detecting mismatching of inter-station operation modes according to claim 20, wherein

when said predetermined request is an RR, it is judged that the operation mode of a terminal station transmitting said signal is in a bi-directional mode.